I got most of these dimensions from SPLparts site. the other is from UAS site. if you dont believe me go look for yourself. Ci is cubic inches (volume) which is Depth X Length X height. CF stands for charge face (charge area) which is the depth X Height. more tube height and depth = more flow more tube length = more cooling (marginal after 6") but more importantly more resistance (ie. pressure drop.) The UAS beats ARC in Both categories. I dont know why people still say ARC is the biggest side mount available.Uas beats the arc by 20ci, and has a 6.5" bigger charge face as well. as a sidenote stillen actually has a .9 bigger charge face than arc as well has .6 less tube length so to me stillen is just as good as arc. Stock: 6.5 “ H x 6.75" W x 2.25" D = 99 ci CF= 14.6 Arc: 8"H x 9"W x 4"D = 288ci CF= 32 Stillen: 9.4"H x 8.4"W x 3.5"D = 276ci, CF= 32.9 Greddy: 6"H x 8"W x 4.5"D = 216ci, CF= 27 HKS: 10.2"H x 7.8"W x 2.5"D = 200ci. CF= 25.5 UAS: 11” H x 8” W x 3.5” D = 308 ci CF= 38.5

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